<template>
    <view class="uni-stat__select">
        <span v-if="label" class="uni-label-text hide-on-phone">{{ label + "：" }}</span>
        <view class="uni-stat-box" :class="{ 'uni-stat__actived': current }">
            <view class="uni-select" :class="{ 'uni-select--disabled': disabled }">
                <view class="uni-select__input-box" @click="toggleSelector">
                    <view v-if="current" class="uni-select__input-text">{{ textShow }}</view>
                    <view v-else class="uni-select__input-text uni-select__input-placeholder">{{
                        typePlaceholder
                    }}</view>
                    <view v-if="current && clear && !disabled" @click.stop="clearVal">
                        <uni-icons type="clear" color="#c0c4cc" size="24" />
                    </view>
                    <view v-else>
                        <uni-icons :type="showSelector ? 'top' : 'bottom'" size="14" color="#999" />
                    </view>
                </view>
                <view v-if="showSelector" class="uni-select--mask" @click="toggleSelector" />
                <view v-if="showSelector" class="uni-select__selector" :style="getOffsetByPlacement">
                    <view :class="placement == 'bottom' ? 'uni-popper__arrow_bottom' : 'uni-popper__arrow_top'"></view>
                    <scroll-view scroll-y="true" class="uni-select__selector-scroll">
                        <view v-if="mixinDatacomResData.length === 0" class="uni-select__selector-empty">
                            <text>{{ emptyTips }}</text>
                        </view>
                        <view
                            v-for="(item, index) in mixinDatacomResData"
                            v-else
                            :key="index"
                            class="uni-select__selector-item"
                            @click="change(item)"
                        >
                            <text :class="{ 'uni-select__selector__disabled': item.disable }">{{
                                formatItemName(item)
                            }}</text>
                        </view>
                    </scroll-view>
                </view>
            </view>
        </view>
    </view>
</template>

<script>
/**
 * DataChecklist 数据选择器
 * @description 通过数据渲染的下拉框组件
 * @tutorial https://uniapp.dcloud.io/component/uniui/uni-data-select
 * @property {String} value 默认值
 * @property {Array} localdata 本地数据 ，格式 [{text:'',value:''}]
 * @property {Boolean} clear 是否可以清空已选项
 * @property {Boolean} emptyText 没有数据时显示的文字 ，本地数据无效
 * @property {String} label 左侧标题
 * @property {String} placeholder 输入框的提示文字
 * @property {Boolean} disabled 是否禁用
 * @property {String} placement 弹出位置
 * 	@value top   		顶部弹出
 * 	@value bottom		底部弹出（default)
 * @event {Function} change  选中发生变化触发
 */

export default {
    name: "UniDataSelect",
    mixins: [uniCloud.mixinDatacom || {}],
    props: {
        localdata: {
            type: Array,
            default() {
                return [];
            }
        },
        value: {
            type: [String, Number],
            default: ""
        },
        modelValue: {
            type: [String, Number],
            default: ""
        },
        label: {
            type: String,
            default: ""
        },
        placeholder: {
            type: String,
            default: "请选择"
        },
        emptyTips: {
            type: String,
            default: "无选项"
        },
        clear: {
            type: Boolean,
            default: true
        },
        defItem: {
            type: Number,
            default: 0
        },
        disabled: {
            type: Boolean,
            default: false
        },
        // 格式化输出 用法 field="_id as value, version as text, uni_platform as label" format="{label} - {text}"
        format: {
            type: String,
            default: ""
        },
        placement: {
            type: String,
            default: "bottom"
        }
    },
    data() {
        return {
            showSelector: false,
            current: "",
            mixinDatacomResData: [],
            apps: [],
            channels: [],
            cacheKey: "uni-data-select-lastSelectedValue"
        };
    },
    computed: {
        typePlaceholder() {
            const text = {
                "opendb-stat-app-versions": "版本",
                "opendb-app-channels": "渠道",
                "opendb-app-list": "应用"
            };
            const common = this.placeholder;
            const placeholder = text[this.collection];
            return placeholder ? common + placeholder : common;
        },
        valueCom() {
            // #ifdef VUE3
            return this.modelValue;
            // #endif
            // #ifndef VUE3
            return this.value;
            // #endif
        },
        textShow() {
            // 长文本显示
            let text = this.current;
            return text;
        },
        getOffsetByPlacement() {
            switch (this.placement) {
                case "top":
                    return "bottom:calc(100% + 12px);";
                case "bottom":
                    return "top:calc(100% + 12px);";
            }
        }
    },

    watch: {
        localdata: {
            immediate: true,
            handler(val, old) {
                if (Array.isArray(val) && old !== val) {
                    this.mixinDatacomResData = val;
                }
            }
        },
        valueCom(val, old) {
            this.initDefVal();
        },
        mixinDatacomResData: {
            immediate: true,
            handler(val) {
                if (val.length) {
                    this.initDefVal();
                }
            }
        }
    },
    created() {
        this.debounceGet = this.debounce(() => {
            this.query();
        }, 300);
        if (this.collection && !this.localdata.length) {
            this.debounceGet();
        }
    },
    methods: {
        debounce(fn, time = 100) {
            let timer = null;
            return function (...args) {
                if (timer) clearTimeout(timer);
                timer = setTimeout(() => {
                    fn.apply(this, args);
                }, time);
            };
        },
        // 执行数据库查询
        query() {
            this.mixinDatacomEasyGet();
        },
        // 监听查询条件变更事件
        onMixinDatacomPropsChange() {
            if (this.collection) {
                this.debounceGet();
            }
        },
        initDefVal() {
            let defValue = "";
            if ((this.valueCom || this.valueCom === 0) && !this.isDisabled(this.valueCom)) {
                defValue = this.valueCom;
            } else {
                let strogeValue;
                if (this.collection) {
                    strogeValue = this.getCache();
                }
                if (strogeValue || strogeValue === 0) {
                    defValue = strogeValue;
                } else {
                    let defItem = "";
                    if (this.defItem > 0 && this.defItem <= this.mixinDatacomResData.length) {
                        defItem = this.mixinDatacomResData[this.defItem - 1].value;
                    }
                    defValue = defItem;
                }
                if (defValue || defValue === 0) {
                    this.emit(defValue);
                }
            }
            const def = this.mixinDatacomResData.find((item) => item.value === defValue);
            this.current = def ? this.formatItemName(def) : "";
        },

        /**
         * @param {[String, Number]} value
         * 判断用户给的 value 是否同时为禁用状态
         */
        isDisabled(value) {
            let isDisabled = false;

            this.mixinDatacomResData.forEach((item) => {
                if (item.value === value) {
                    isDisabled = item.disable;
                }
            });

            return isDisabled;
        },

        clearVal() {
            this.emit("");
            if (this.collection) {
                this.removeCache();
            }
        },
        change(item) {
            if (!item.disable) {
                this.showSelector = false;
                this.current = this.formatItemName(item);
                this.emit(item.value);
            }
        },
        emit(val) {
            this.$emit("input", val);
            this.$emit("update:modelValue", val);
            this.$emit("change", val);
            if (this.collection) {
                this.setCache(val);
            }
        },
        toggleSelector() {
            if (this.disabled) {
                return;
            }

            this.showSelector = !this.showSelector;
        },
        formatItemName(item) {
            let { text, value, channel_code } = item;
            channel_code = channel_code ? `(${channel_code})` : "";

            if (this.format) {
                // 格式化输出
                let str = "";
                str = this.format;
                for (let key in item) {
                    str = str.replace(new RegExp(`{${key}}`, "g"), item[key]);
                }
                return str;
            } else {
                return this.collection.indexOf("app-list") > 0
                    ? `${text}(${value})`
                    : text
                      ? text
                      : `未命名${channel_code}`;
            }
        },
        // 获取当前加载的数据
        getLoadData() {
            return this.mixinDatacomResData;
        },
        // 获取当前缓存key
        getCurrentCacheKey() {
            return this.collection;
        },
        // 获取缓存
        getCache(name = this.getCurrentCacheKey()) {
            let cacheData = uni.getStorageSync(this.cacheKey) || {};
            return cacheData[name];
        },
        // 设置缓存
        setCache(value, name = this.getCurrentCacheKey()) {
            let cacheData = uni.getStorageSync(this.cacheKey) || {};
            cacheData[name] = value;
            uni.setStorageSync(this.cacheKey, cacheData);
        },
        // 删除缓存
        removeCache(name = this.getCurrentCacheKey()) {
            let cacheData = uni.getStorageSync(this.cacheKey) || {};
            delete cacheData[name];
            uni.setStorageSync(this.cacheKey, cacheData);
        }
    }
};
</script>

<style lang="scss">
$uni-base-color: #6a6a6a !default;
$uni-main-color: #333 !default;
$uni-secondary-color: #909399 !default;
$uni-border-3: #e5e5e5;

/* #ifndef APP-NVUE */
@media screen and (max-width: 500px) {
    .hide-on-phone {
        display: none;
    }
}

/* #endif */
.uni-stat__select {
    display: flex;
    align-items: center;
    // padding: 15px;
    /* #ifdef H5 */
    cursor: pointer;
    /* #endif */
    width: 100%;
    flex: 1;
    box-sizing: border-box;
}

.uni-stat-box {
    width: 100%;
    flex: 1;
}

.uni-stat__actived {
    width: 100%;
    flex: 1;
    // outline: 1px solid #2979ff;
}

.uni-label-text {
    font-size: 28px;
    font-weight: bold;
    color: $uni-base-color;
    margin: auto 0;
    margin-right: 10px;
}

.uni-select {
    font-size: 28px;
    border: 2px solid $uni-border-3;
    box-sizing: border-box;
    border-radius: 8px;
    padding: 0 10px;
    padding-left: 20px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    user-select: none;
    /* #endif */
    flex-direction: row;
    align-items: center;
    border-bottom: solid 2px $uni-border-3;
    width: 100%;
    flex: 1;
    height: 60px;

    &--disabled {
        background-color: #f5f7fa;
        cursor: not-allowed;
    }
}

.uni-select__label {
    font-size: 32px;
    // line-height: 22px;
    height: 60px;
    padding-right: 20px;
    color: $uni-secondary-color;
}

.uni-select__input-box {
    height: 60px;
    width: 0;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex: 1;
    flex-direction: row;
    align-items: center;
}

.uni-select__input {
    flex: 1;
    font-size: 28px;
    height: 44px;
    line-height: 44px;
}

.uni-select__input-plac {
    font-size: 28px;
    color: $uni-secondary-color;
}

.uni-select__selector {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    /* #endif */
    position: absolute;
    left: 0;
    width: 100%;
    background-color: #ffffff;
    border: 2px solid #ebeef5;
    border-radius: 12px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    z-index: 3;
    padding: 8px 0;
}

.uni-select__selector-scroll {
    /* #ifndef APP-NVUE */
    max-height: 400px;
    box-sizing: border-box;
    /* #endif */
}

/* #ifdef H5 */
@media (min-width: 768px) {
    .uni-select__selector-scroll {
        max-height: 600px;
    }
}

/* #endif */

.uni-select__selector-empty,
.uni-select__selector-item {
    /* #ifndef APP-NVUE */
    display: flex;
    cursor: pointer;
    /* #endif */
    line-height: 60px;
    font-size: 28px;
    text-align: center;
    /* border-bottom: solid 1px $uni-border-3; */
    padding: 0 20px;
}

.uni-select__selector-item:hover {
    background-color: #f9f9f9;
}

.uni-select__selector-empty:last-child,
.uni-select__selector-item:last-child {
    /* #ifndef APP-NVUE */
    border-bottom: none;
    /* #endif */
}

.uni-select__selector__disabled {
    opacity: 0.4;
    cursor: default;
}

/* picker 弹出层通用的指示小三角 */
.uni-popper__arrow_bottom,
.uni-popper__arrow_bottom::after,
.uni-popper__arrow_top,
.uni-popper__arrow_top::after {
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 12px;
}

.uni-popper__arrow_bottom {
    filter: drop-shadow(0 4px 24px rgba(0, 0, 0, 0.03));
    top: -12px;
    left: 10%;
    margin-right: 6px;
    border-top-width: 0;
    border-bottom-color: #ebeef5;
}

.uni-popper__arrow_bottom::after {
    content: " ";
    top: 2px;
    margin-left: -12px;
    border-top-width: 0;
    border-bottom-color: #fff;
}

.uni-popper__arrow_top {
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
    bottom: -6px;
    left: 10%;
    margin-right: 6px;
    border-bottom-width: 0;
    border-top-color: #ebeef5;
}

.uni-popper__arrow_top::after {
    content: " ";
    bottom: 2px;
    margin-left: -12px;
    border-bottom-width: 0;
    border-top-color: #fff;
}

.uni-select__input-text {
    // width: 280px;
    width: 100%;
    color: $uni-main-color;
    white-space: nowrap;
    text-overflow: ellipsis;
    -o-text-overflow: ellipsis;
    overflow: hidden;
}

.uni-select__input-placeholder {
    color: $uni-base-color;
    font-size: 24px;
}

.uni-select--mask {
    position: fixed;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    z-index: 2;
}
</style>
